[Intel-gfx] v3.12 does not work on ByT-I

[Bityutskiy, Artem]

Hi,

Tizen IVI does not boot to UI anymore on ByT-I boards with kernel 3.12,
just like with 3.12-rc1, rc2, etc. v3.11 works fine.

I tried to enable drm.debugging, but could not figure out what is going
wrong. I've attached one debug log (drm.debug=0xFF). I can lessen the
verbosity if needed.

Anyway, I've bisected it, and found out that this commit fixes our
problem:

0b6279520519 drm/i915/vlv: re-enable hotplug detect based probing on VLV/BYT

Jesse, Daniel, any idea what is the issue and why this patch fixes it?
The thing is that Tizen IVI boots to UI just fine with 3.12 plus this
patch, while stock 3.12 does not work.

We also have this bug-report about the problem:
https://bugs.tizen.org/jira/browse/TIVI-2085

Are OK sending this patch to GregKH / stable for 3.12.x inclusion?

Thanks!

-- 
Best Regards,
Artem Bityutskiy
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